Ah, what the heck. I'm in. Maybe I can come up with a decent combination of flat and spinny work.
A couple of suggestions:
Size? I'll be shooting for something that'll fit into a Flat Rate box, but I don't see why someone couldn't go bigger if they want the added shipping expense. (Keep in mind some turned boxes may be considerably smaller and lighter than most flatwork boxes.)
Dovetails? I'd vote do 'em if you want, but no requirement for them, so more folks will be likely to participate. Not all flatworkers have a desire to hand-cut dovetails, especially some of the beginners (or some of the turners who might be thinking of a flat box).
And I'm good with March.